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R STEEL SewingMaohine Treadle. No. 234,498. Patented Nov. 16, I880.

In a d o M 0 N FIGJ TIGB f &

UNTTEE' STATES PATENT @FFlCEQ ROBERT STEEL,

FIFTHS OF HIS RIGHT TO CHAR CHARLES A. SPRING, AND WM. A.

OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF FOUR- SEWING-MACHINE TREADLE.

SPECIFICATION forming part of Letters 1? To all whom it may concern Beit known that 1, ROBERT STEEL, a citi zen of the United States, residingat Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented a new and useful Improvement inSewing-Machine Treadles, of which the following is a specification.

The nature of myinve'ntion mainly consists in the combination of acoil-spring with the upper end of the treadle of a sewing-machine andthe table in such a manner as to assistin returning the treadle from itsbackward to its forward position, and also to hold it securely in 1 thelatter position when the machine is not in motion, as hereinafter fullydescribed.

In theaccompanying drawings, which make a part of this specification,Figure 1 is afront view of my improved treadle in connection with thetable of a sewing-machine. Fig. 2is

an edge view of the same. Fig. 3 is a vertical longitudinal section, onan enlarged scale, of the bracket 0, barrel D, pin a, and the upper partof the coilspring E. Fig.4 is across- 2 section taken at the dotted linea or of Fig. 3. Fig. 5 is a cross-section taken at the dotted line y yof Fig. 3 on double the scale thereof, showing the spring E inconnection with the barrel D and treadle B and the barrel in con- 0nection with the pin a by means of the spline cl and groove 6. Figs. 6and 7 are respectively end and side views of the barrel D on an enlargedscale, showing a modified form of means for adjusting the barrel by theratchet-wheel Grand pawl '6. Fig.8 is another modified form,

in which the bracket 0 and barrel D are in a single piece.

Like letters of reference in all the figures indicate the same parts.

A represents the table of a sewing-machine, and B an oscillatingtreadle, connected therewith by means of the bracket 0 and centerpin a.The treadle is provided with two arms, I) and b,at its upper end. Thearm I) connects 5 with the log 0 of the bracket, which also has lugs c,0 and c for the support of the centerpin a, on which the arm I)oscillates, the arms fitting between the lugs c and 0 atent No. 23

Application filed September 28, 1880. (No model.)

4,498, dated November 16, 1880.

D is a barrel on the center-pin a, and E a spring, one end of which isattached to the barrel and coiled around it. The other end is fastenedto the upper end of the treadle B, as represented in the drawings, toassist in returning the treadle in each revolution of the crank to itsfront position, and also to retain it in that position when the machineis not at work.

To provide for a quick and accurate adj ustmentot' the tension of thespring, the centerpin a has a screw-connection with the lug orprojection c of the bracket 0, as shown in Fig.

3, so that by placing a wrench on the head 9 of the pin and turning thepin in the right direction the proper axial adjustment of the barrel maybe effected. The pin a is provided with a spline, cl, whi

ch connects with the iongitudinal groove 0 in the eye of the barrel, andis adapted to slide therein to avoid the longitudinal movement of thelatter during the like movement of the pin in the axial adjustment ofthe barrel in regulating the tension of the spring, and thus admittingof the barrel fitting snugly between the lugs c and c to keep the springin line with the vertical plane of the movement of the treadle. The lugc has a 5 groove, 0, somewhat larger than the spline d, for the passageof the latter in connecting the pin a with the lugs 0, c and c. The pinis held securely in its adj usted position by means of the jam-nut f.

FigsG and 7 show a modification of the construction, whereby the axialadjustment of the barrel D is effected. The latter is provided with aratchet-wheel, G, on one end, with which the pawl h eng in the properdirection by means of a wrench placed at i, where the barrel is theproper form to fit the wrench. The pawl is hung on the pin j, which isscrewed into the lug c of the bracket 0. The barrel turns freely on thepin a, the latter being fastened in the lugs 0, c and 0 If desired,instead of the barrel D having an axial movement, it may have a fixedposition between the lugs c and c and form a part of 5 the bracket orcasting O, as shown in the ages when the barrel is turned 8 5 large"ertical longitudinal section, Fig. 8; and instead ofthe bracket beingin a single piece, I may sometimes make it in sections.

A spiral spring placed on the barrel D or pin a may take the place ofthe coil-spring E. The latter, however, is preferable, being moredurable, as the strain is in the direction of the longitudinal positionof the fibers, while there is much lateral strain on the fibers ofspiral springs.

I claim as my invention- 1. The combination, with the tabfe A, of thebracket G,tl1e treadle B, pivoted to said bracket, pin a, barrel D, andspring E, connected atits ends to said barrel and treadle, substantiallyas described.

2. The combination, with the table A, of the bracket 0, treadle B,pivoted to said bracket,

ROBERT STEEL.

\Vitnesses:

THoMAs J. BEWLEY, STEPHEN USTIOK.

substantially as 30

